Microsoft JScript 5.1, 5.5, and 5.6 on Windows 2000 SP4, and 5.6 on Windows XP, Server 2003, Windows 98 and Windows Me, will "release objects early" in certain cases, which results in memory corruption and allows remote attackers to execute arbitrary code.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2003
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1785
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1644
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1067
https://exchange.xforce.ibmcloud.com/vulnerabilities/26805
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-023
http://www.vupen.com/english/advisories/2006/2321
http://www.us-cert.gov/cas/techalerts/TA06-164A.html
http://www.securityfocus.com/bid/18359
http://www.kb.cert.org/vuls/id/390044